Induction of charge density waves by spin density waves in iron ...

BALATSKY, BASOV, AND ZHU
Fourier-transform FT STM by Hoffman et al. 14 and by
Howald et al. 15 has been used to observe CDW modulation
in cuprates. Similarly, FT STM would be a powerful tool to
reveal formation of the new CDW peaks in quasiparticle interference
and in topographic images. iv We expect that
strain in the crystal will play a major role in generating CDW
since microscopically the coupling between SDW and CDW,
Eq. 1, will occur due to local magnetoelectric coupling.
Evidence for strong lattice-magnon coupling in pnictides has
been seen in recent Fe isotope experiments. 22 The CDW will
be formed in the crystals with the defects and twin or grain
boundaries. We note that recent scanning superconducting
quantum interference device magnetometry on the twin
PHYSICAL REVIEW B 82, 144522 2010
boundaries indicate that superfluid density is enhanced near
the areas of local strain and frustrated magnetism. 23
ACKNOWLEDGMENTS
We are grateful to S. Kivelson, J. Lorenzana, V. Madhavan,
and I. Mazin for useful discussion and for sharing the
preliminary STM data. The hospitality of the Aspen Center
for Physics A.V.B. and the Kavli Institute for Theoretical
Physics A.V.B. and J.-X.Z. are gratefully acknowledged.
This work was supported by U.S. Department of Energy
through LDRD and BES funds, the National Science
Foundation under Grant No. PHY05-51164, and the UCOP-
09-027.
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